That's a very strange site for many reasons. The least of the weirdness is using stock photos for fake activity! I definitely think it should note "posed by models" if they're using stock images.
I looked at the terms and conditions plus the FAQ. I got a chuckle out of the first two tips for replying to a PenPal request:
"When possible, run a background check to verify the authenticity of each poster.
Avoid disclosing too much information; do not share data such as passwords, bank details or even the movement schedule of family members to prevent stalking or housebreaking."
A background check? Are they expecting all sorts of creepy stalkers to be on the site to prey on the target kid audience and for them to be daft enough to give out enough real information to run a background check?
The site is based in Singapore, so perhaps this is something typical there - I wouldn't let my kids anywhere near a site like this